Help 7Dpo

Saday • I`m 24yrs old TTC #2
I'm 7dpo and this morning when I went use the restroom I noticed some pink discharge only when I wipe but a half of hour later it was red and now it just stopped I have dull cramping in my uterus area and lower back ache and Af isn't due until the 11th. Could this be implantation or early period?